If paOutDevice was not a saved setting, use Pa_GetDefaultOutputDevice().
This allows wsjtx to startup with default audio on a new install.
However, it does not set the menu index numbers, so the Config SoundIn/Out
menus do not look correct, until they have been set and saved once.
It would be better if only the device names were saved in settings,
because the index numbers can change, especially if USB soundcards
are added or removed.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3339 ab8295b8-cf94-4d9e-aec4-7959e3be5d79